UI: Use config file for color format/space/range

Allows the color format, color space, and color range to be set by the
user.  This will need user interface for in the future, though it'll
have to be an advanced setting that's hidden from the user by default
because I don't feel comfortable exposing this to a typical user.

obs/window-basic-main.cpp

@@ -472,6 +472,10 @@ bool OBSBasic::InitBasicConfigDefaults()
 	config_set_default_uint  (basicConfig, "Video", "FPSNum", 30);
 	config_set_default_uint  (basicConfig, "Video", "FPSDen", 1);
 	config_set_default_string(basicConfig, "Video", "ScaleType", "bicubic");
+	config_set_default_string(basicConfig, "Video", "ColorFormat", "NV12");
+	config_set_default_string(basicConfig, "Video", "ColorSpace", "709");
+	config_set_default_string(basicConfig, "Video", "ColorRange",
+			"Partial");
 
 	config_set_default_uint  (basicConfig, "Audio", "SampleRate", 44100);
 	config_set_default_string(basicConfig, "Audio", "ChannelSetup",
@@ -1355,6 +1359,24 @@ static inline enum obs_scale_type GetScaleType(ConfigFile &basicConfig)
 		return OBS_SCALE_BICUBIC;
 }
 
+static inline enum video_format GetVideoFormatFromName(const char *name)
+{
+	if (astrcmpi(name, "I420") == 0)
+		return VIDEO_FORMAT_I420;
+	else if (astrcmpi(name, "NV12") == 0)
+		return VIDEO_FORMAT_NV12;
+#if 0 //currently unsupported
+	else if (astrcmpi(name, "YVYU") == 0)
+		return VIDEO_FORMAT_YVYU;
+	else if (astrcmpi(name, "YUY2") == 0)
+		return VIDEO_FORMAT_YUY2;
+	else if (astrcmpi(name, "UYVY") == 0)
+		return VIDEO_FORMAT_UYVY;
+#endif
+	else
+		return VIDEO_FORMAT_BGRA;
+}
+
 int OBSBasic::ResetVideo()
 {
 	struct obs_video_info ovi;
@@ -1362,6 +1384,13 @@ int OBSBasic::ResetVideo()
 
 	GetConfigFPS(ovi.fps_num, ovi.fps_den);
 
+	const char *colorFormat = config_get_string(basicConfig, "Video",
+			"ColorFormat");
+	const char *colorSpace = config_get_string(basicConfig, "Video",
+			"ColorSpace");
+	const char *colorRange = config_get_string(basicConfig, "Video",
+			"ColorRange");
+
 	ovi.graphics_module = App()->GetRenderModule();
 	ovi.base_width     = (uint32_t)config_get_uint(basicConfig,
 			"Video", "BaseCX");
@@ -1371,9 +1400,11 @@ int OBSBasic::ResetVideo()
 			"Video", "OutputCX");
 	ovi.output_height  = (uint32_t)config_get_uint(basicConfig,
 			"Video", "OutputCY");
-	ovi.output_format  = VIDEO_FORMAT_NV12;
-	ovi.colorspace     = VIDEO_CS_709;
-	ovi.range          = VIDEO_RANGE_FULL;
+	ovi.output_format  = GetVideoFormatFromName(colorFormat);
+	ovi.colorspace     = astrcmpi(colorSpace, "601") == 0 ?
+		VIDEO_CS_601 : VIDEO_CS_709;
+	ovi.range          = astrcmpi(colorRange, "Full") == 0 ?
+		VIDEO_RANGE_FULL : VIDEO_RANGE_PARTIAL;
 	ovi.adapter        = 0;
 	ovi.gpu_conversion = true;
 	ovi.scale_type     = GetScaleType(basicConfig);